Erlotinib is an orally small molecule inhibiting the tyrosine kinase activity of the epidermal growth factor receptor (EGFR). Currently, erlotinib, at a standard oral daily dose of 150 mg, is licensed for the treatment of unselected recurrent non-small cell lung cancer (NSCLC) patients, however, it is being investigated in all stages of NSCLC. Erlotinib is well tolerated, with common toxicities including rash and diarrhoea. The optimization of the therapeutic impact of erlotinib in NSCLC will be more defined when reliable predictive factors are identified. An important step has been made in the molecular characterization of potentially sensitive NSCLC patients. In fact, we have learned that activation, somatic EGFR gene mutations within the tyrosine kinase domain, are associated with a high possibility of a long lasting therapeutic response to erlotinib. The present review discusses the role of erlotinib in the treatment of NSCLC.
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